Journal
MICROELECTRONICS RELIABILITY
Volume 55, Issue 1, Pages 114-122Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.microrel.2014.09.014
Keywords
Activated carbon; Fe3O4; Hydrazine method; Supercapaictor
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2012R1A1A2008884]
- Global Ph.D. Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2014H1A2A1021380]
- National Research Foundation of Korea [2012R1A1A2008884] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Oxidized activated carbon/Fe3O4 (AC/Fe3O4) composites for supercapacitor electrodes were synthesized by a reduction method. Poly(vinylpyrrolidone) was added as a dispersing agent for homogeneous deposition of Fe3O4 on AC. The obtained products were identified as AC/Fe3O4 by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. Morphological characterization of AC/ Fe3O4 was carried out by field emission scanning electron microscopy (FE-SEM); the results clearly showed the formation of Fe3O4 nanoparticles about 30 nm in diameter on AC. Moreover, by using N-2 adsorption/desorption isotherm analysis, we confirmed that surface areas and pore volumes decreased with increasing Fe3O4 content. We also carried out electrochemical characterization of AC and AC/Fe3O4 composites. Remarkably, we found that the value of specific capacitance increased significantly from 99.4 F g(-1) of raw AC to 202.6 F g(-1), of AC/Fe3O4 composites at 10 mV s(-1) of scan rate. This result can be ascribed to a synergistic effect of the combination of electrical double-layer capacitance and pseudo-capacitance properties. This research represents a valuable contribution to the application of supercapacitor electrodes in regard to cost effectiveness and simple fabrication. (C) 2014 Elsevier Ltd. All rights reserved.
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